Automatic relief-valve



(No Model) F. SOHREIDT.

AUTOMATIC RELIEF VALVE. No. 433,543. Patented Aug. 5, 1890.

ZMWM I C. I 5 (Imam M13 f UNITED STATES PATENT OFFICE.

FRANK. SOHREIDT, OF MANSFIELD, OHIO.

AUTOMATIC RELI EF-VALVE.

SPECIFICATION forming part of Letters Patent No. 433,543, dated August 5, 1890.

Application filed February 24, 1890- Serial No. 341,611. (No model.)

T0 aZZ whom it may concern.-

' Be itknown that I, FRANK. SCHREIDT, a citizen of the United States, and a resident of Mansfield, in the county of Richla nd and State of Ohio, have invented certain new and useful Improvements in Combined Cylinder- Oocks and Automatic Relief-Valves, of which the following is a specification.

The object of my invention is to provide a cylinder-cock with an automatic relief-valve, which may be readily set to open at any pressure desired.

The invention consists in the peculiar arrangement and combination of the parts illustrated in the accompanying drawings, in connection with which .the invention will be Referring first to Fig. 1, the valve-case A,

which is cylindrical in form, has an interiorly-screw-threaded extension at for attachment to a steam-cylinder or other article to which a relief-cock is applicable or desirable. The extension a may be exteriorly screwthreaded to be applied directly to the cylinder instead ofinteriorly threaded to be secured upon the end of a nipple or pipe which communicates with the cylinder. lhe valvecase has also the customary exhaust-port a, which is interiorly screw-threaded to receive a pipe to carry the exhaust to any place de-- sired. The upper portion of the shell or case A is interiorly screw-threaded to engage the exterior threads upon the lower portion of the cylindrical shell B. The valve 0 is also an interiOrly-screwthreaded shell. The lower portion is turned off to bear truly upon the valve-seat C62 when closed down in the position shown, and the upper portion is provided with guide-pins c, which project into vertical grooves in the cylinder B to prevent the shell C from turning with the valve-rod D, the lower screw-threaded portion of which engages the interior screw-threads within the cylindrical portion of the valve 0.

The lower end of rod D is a valve to open or close the port 0 in the lower end. of shell C. The shell 0 is perforated above its interior valve-seat c to form ecluction-ports,which lead to the exhaust branch to. i

The automatic relief-valve O is forced and held upon its seat a by a spring E, which is coiled around the rod D and compressed between the top of cylinder B and the top edge of the shell C.

It will be seen that when the ports are in the position shown in Fig. 1 the port through extension a is controlled by the pressure of spring E and the pressure of this spring is regulated by screwing the cylinderB farther into or out of the case A. Vhen the spring is regulated to the pressure desired, the parts are locked in position by the jam-nut F, which is fitted to the exterior screw-threaded portion of shell B. The exterior of nut F is angular to receive the jaws of awrench or key, by

which it is forced against the top edge of the case A or released therefrom. The bosses b on cylinderBand the boss a on extension a are also angular, so that the parts may be adjusted to position by a wrench. G is a packing-nut to prevent the escape of steam from the top of cylinder B.

To adjust my automatic relief-valve to the pressure desired, (assuming the device to be secured to a steam-cylinder and the interior valve closed,) the jam-nut F is loosened and steam raised to the required pressure, as indicated by a gage. The cylinder B is now adjusted inwardly until the pressure of the spring E closes the valve 0 down upon its seat a The jam-nut F is forced against the top edge of case A, firmly locking the case A and cylinder together. Now should the pressure be increased the relief-valve or cylinder 0 would be lifted and held from its seat a until the excess of pressure is reduced, when the valve will be automatically closed by its spring E.

It will be seen that the opening through port a is controlled by the hand-valve D through hand-wheel d, and that this valve is entirely independent of the automatic reliefvalve 0, so that no matter at what pressure the automatic relief-valve is set the handvalve is operated precisely the same as the common cylinder-cock.

The form shown-in Fig. 2 differs from that shown :in Fig.;1,1in.that the automatic reliefvalve is the inner instead of the outer valve, the outer valve being the one which is oper- 5 ated by the hand-wheel. The cylinder the lower end of which forms the hand-valve, ex-

tends up through and above the outer case A, and is interiorly screw-threaded at its upper end to engage the exteriorlyscrew- [0 threaded portion of the hand-wheel rod D, The automatic relief-valve H is held to its seat within the cylinder 0 by the spiral spring E, which presses upon the back of the /valve H, and is compressed between the valve i and lower edge of the hand-rod D. The valve H has an upwardly-projecting stem h, which enters the coils of the spring and holds thevalvetr-uet The tension-"of the spring is regulated by screwing the rod- D. farther into or-retracting it-from the cylinder'C-f. When the valve is adjusted to theproper tension, the rod D! and cylinder 0\ are firmly locked together bythe jam-nutFC I is a packing nut screwed onto the topof the case A, and J is a perforated rose-head, the: shank of which is screwed into the branch 0/; Itsobject is to'brealrthe volume of the steam zwhen: discharged into. the roomxinstead-of being carried to the outside,

My device is designed mainly as a cylindercock; but-owing to its compactness,-simplicity of- 'constructiomand durabilityit iswell adapted for a relief-valve-for steam-registers and other steam appliances.

What I claim is-= 1. The combination of-tl1e=valve-case, a: main valve and'spring-pressed relief-valve, onewithin: the. other within said case,'said' relief-valve being arranged to operate 111(16-40 pendently; of the main valve, and means, such as shown, to regulate the pressure with which the relief-Valve is held to its seat, a hand-wheel or similar means to operate the main valve, each valve being movable in relationto its seat-independently of the other, substantially as shown and described.

2.. The combination, substantially as hereinbefore set forth, of the outer case interiorly screw-threaded and having a valve-seat, as a an exteriorly-screw-threaded cylinder longitudinally adjustable within said case, a j am-nut for locking the outer case and inner cylinder when adjusted, a hand-valve and springpressed relief-valve, one within the other, the coiled spring bearing uponthe relief-valve, the handvalve rod: extending through theinner cylinder, and a hand-wheel to operate said valve independently of: "the relief-valve. I

3.- The combination'of the two cylinders A B, movable one within-the other,-.-the reliefvalve (3, movable longitudinallywithin :-the inner cylinder and havingpins toprevent-it from rotating, a spring to hold thevalve .C to its seat, the tension of said spring beingregulated by moving the cylinders'A B onewithin the other, the jam-nut to lock said cylinders; and the. hand-valve-within' the relief-valve havi-ngits rod D extending through" the spring,- and cylinders to actuate said valve independent of the relief-valve O, substantially as shown and described.

FRANK SCHREI'DT;

Witnesses:

GEo. J. MURRAY, FRANK. L. lVIILLWARDl 

